Hydraulic lift



May 15, 1934. w. H. WARNER HYDRAULIC LIFT Filed.Feb. 10, 1934 2 Sheets-Sheet W11 WIDE] .inurntur Zlrturnrgs.

May 15, 1934.

HYDRAULIC LIFT Filed Feb. 10, 1934 2 Sheets-Sheet 2 will?! Enhcntnr w. H. WARNER 1,958,960

Patented May 15, 1934 Y I r I UNITED STATES PATENT FFECE 1,958,960 HYDRAULIC LiFT William H. Warner, Ottawa, Kans. Application February 10, 1934, Serial No. 710,701

' 7 Claims. (01. 254-473) This invention relates to automobile lifts of also formed at the lower end of the bearing 8, the hydraulic type, the primary object of the inproviding communication between the space vention being to provide a lift comprising a pair formed by the cut out portion 12, and cylinder 5, of cylinders, in which vertically movable pistons for venting purposes.

operate under hydraulic pressure, the construc- At the upper end of cylinder 6, is a bearing tion of the cylinders being such that one cylinder member 14, which bearing member also has cut constitutes a tank containing fluid to be forced out portions 15 and 16 that communicate through into the adjacent cylinder, operating the piston the port 1'7, the port 1''! being formed at the lower movable therein. end of the vent opening 18, that is normally to An important object of the invention is the sed by means of the p provision of a hydraulic lift wherein a pair of Operating within these bearings, are pistons 20 lifting pistons are employed, the operating means and 21, the piston 20 being provided with an being such that the movement of one piston opening in its lower end, through which the pipe is governed by the movement of the adjacent 22 extends, the pipe 22 terminating at a point 15 piston, thereby insuring the pistons moving evenly near the upper end of the piston, so that air and in unison. directed to the cylinder and piston, will be dis- With the foregoing and other objects in view, charged against the upper end of the piston and which will appear as the description proceeds the against the oil within the piston. invention resides in the combination and ar- The piston 21 has its lower end closed and is of 20 rangement of parts and in the details of conthe type commonly known as the full hydraulic struction hereinafter described and claimed, it lift, or the type wherein fluid pressure against the being understood that changes in the precise bottom or lower end of the piston, operates to embodiment of the invention herein disclosed, elevate the piston. The pipe 22 has connection may be made within the scope of what is claimed, with the pipe 23, which in turn is connected with 25 without departing from the spirit of the inventhe pipe 24, known as the supply pipe for the lift. tion. One end of the pipe 23 extends laterally, where Referring to the drawings: it communicates with the cut out portion 12 of Figure 1 is a longitudinal sectional view the cylinder 5. Air under pressure is directed through a lift constructed in accordance with to the pipe 24, through the pipe 25, the passage of 30 the invention. the air through the pipes, being controlled by Figure 2 is a sectional view taken on line 22 means of the valves 26 and 27, the valve 27 con-j of Figure 1. trolling the passage of the air to the atmosphere,

Figure 3 is a sectional view taken on line 33 allowing the air to exhaust and the pistons to of Figure 1. move to their initial or lowermost positions.

35' Figure 4 is an enlarged sectional view illus- The upper end of the piston 20 is formed with trating the vent port and construction of the a filling opening, which is normally closed by the upper portion of the cylinders. plug 28, whereby the piston 20 and cylinders may Figure 5 is a sectional view taken on line 5-5 be filled with oil. of Figure 1. At the upper ends of the pistons, is an angle Referring to the drawings in detail, the referbar 29 that connects the pistons and a part of ence character 5 designates one of the cylinders the track structure of the lift, not shown. of the lift, and the reference character 6 desig- Shoulders 30 are formed at the lower ends of nates the other cylinder of the lift, the cylinders the pistons 20 and 21 and are adapted to enbeing in communication with each other, through gage the lower ends of the bearings, thereby rethe pipe 7, which is disposed near the lower ends stricting vertical movement of the pistons, and of the cylinders. preventing the pistons from being forced out of Secured within the upper end of the cylinder 5, the upper ends of the cylinders. A stop 16 is is an elongated bearing 8, which is held in posiformed at the bottom of the cylinder 5 and retion, by means of the rods 9, that have their upper stricts downward movement of the piston 20.

ends threaded to receive the nuts 10. This bear- It will of course be understood that these ing member 8 is formed with cut out portions 11 cylinders are embedded in the ground surface, so and 12 respectively, which cut out portions are in that the upper ends of the pistons operating withcommunication with each other, through the pasin the cylinders, will be extended a slight distance sageways 13 at their lower ends, and through above the ground surface. The cylinders are held ports 13' at their upper ends. Openings 14 are in proper spaced relation with each other by means of the bearing members that are se cured to the cylinders and arranged in spaced relation with each other.

In the use of the lift, an automobile is driven onto the tracks of the lift, whereupon air under pressure is admitted to the piston 20, the air acting against the head of the piston and oil level in the cylinder.

Oil is forced into the cylinder 6, causing the piston 21 thereof to be elevated, and since the pressure in both cylinders is equal, and because one piston relies on the movement of the adjacent piston, the pistons will move vertically in unison.

When it is desired to lower the lift, the valve 27 is operated to exhaust the air from the system, allowing the pistons to move downwardly and the oil to assume its normal level as shown in Figure 1 of the drawings.

Having thus described the invention, what is claimed is:

1. An automobile lift comprising in combination, a pair of cylinders, pistons operating in the cylinders, said cylinders adapted to contain oil, a pipe establishing communication between the cylinders, one of the pistons having an open bottom, an air pipe extending into the piston having the open bottom, the: discharge end of the pipe being disposed above the oil level in the cylinders, and adapted to discharge air against the head of the piston forcing the oil into the adjacent cylinder and elevating the pistons simultaneously.

2. An automobile lift comprising in combination, a pair of cylinders, pistons operating in the cylinders, said cylinders adapted to contain oil, a pipe establishing communication between the cylinders whereby oil passes from one cylinder to the other cylinder, one of the pistons having an opening in its bottom, a pipe extending into the open-ended piston and adapted to direct air under pressure to the space between the oil level in the piston and head of the piston, moving the piston upwardly and forcing the oil against the piston in the adjacent cylinder, elevating the u; pistons simultaneously.

. 3. An automobile lift comprising in combination, a-pair of communicating cylinders adapted .to contain oil, pistons operating in the cylinders, one of the pistons having an opening in the bottom thereof allowing oil to enter, the piston, a

pipe extending into one of the pistons and adapted to discharge air at a point between the head the bottom thereof permitting oil to pass into the piston, a pipe extending into the open-ended piston and adapted to direct air under pressure to thespace between the head of the piston and oil level,'forcing the oil in one cylinder against the pistonof, the adjacent cylinder elevating the pistons and means for controlling the passage of air under pressure to the cylinders.

5. An automobile lift comprising a pair of cylinders, lifting pistonsoperating within the cylinders, a pipe establishing communication between the cylinders, said cylinders containing oil, means for directin air under pressure to one of the cylinders, thereby forcing oil from one cylinder againstthe piston of the adjacent cylinder, thereby elevating thepistons, and means for controlling the passage of air to the lift,

6. An automobile lift, comprising in combination, a pair of communicating cylinders. adapted to contain oil, pistons movable in the cylinders, one of the cylinders constituting a reservoir for supplying .oil to the adjacent cylinder, and means for'directing air to the cylinder constituting the oil reservoir, lifting the piston containedtherein and forcing the oil against the piston of the adjacent cylinder, simultaneously lifting the pistons.

7. 'An aut om'obile lift comprising in combination, a pair of cylinders, said-cylinders adapted to contain oil, pistons operating within the cylinders, an air pipe extending into one of the pistons andhavingthe discharge end thereof disposed above the oil level, the piston in the opa posite cylinder having its lowermost wall closed, means for directing air to the cylindersfand means for controlling the passage of air to the cylinders.

WILLIAM H. 

